<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h3>内置验证码生成以及验证：</h3>
<div>{:captcha_img()}</div>

<form action="/index/verify01" method="post">
    <p>请输入验证码： <input type="text" name="yzm" /> </p>
    <p><input type="submit" value="提交"></p>
</form>
</body>
</html>